In Leghorn chickens, the color of the feathers is due to the presence of the dominant gene C.

In Leghorn chickens, the color of the feathers is due to the presence of the dominant gene C. If it is in a recessive state, then the color does not develop. The action of this gene is influenced by gene I, which in a dominant state suppresses the development of a trait controlled by gene C. Determine the probability of birth of a colored chicken from crossing chickens with genotypes CCIi and ccii.

Leghorn chickens with the CCIi genotype will be colorless; they will produce CI and Ci germ cells.

Chickens ccii will also be colorless, their organisms will produce the same type of ci germ cells.

The offspring obtained from crossing these individuals with each other will look like this:

chickens whose plumage color does not develop (CcIi) – 50%;

chickens with colored plumage (Ccii) – 50%.

Answer: the probability of birth of a colored chicken from colorless chickens with the indicated genotypes is 50%.